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                    动画
            
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        <a href=".." >ListView</a>
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                                <h2 id="listview">ListView</h2>
<p>ListView&#x662F;&#x6700;&#x5E38;&#x7528;&#x7684;&#x53EF;&#x6EDA;&#x52A8;widget&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x6CBF;&#x4E00;&#x4E2A;&#x65B9;&#x5411;&#x7EBF;&#x6027;&#x6392;&#x5E03;&#x6240;&#x6709;&#x5B50;widget&#x3002;&#x6211;&#x4EEC;&#x770B;&#x770B;ListView&#x7684;&#x9ED8;&#x8BA4;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5B9A;&#x4E49;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">ListView</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>  
  <span class="token comment">//&#x53EF;&#x6EDA;&#x52A8;widget&#x516C;&#x5171;&#x53C2;&#x6570;</span>
  Axis scrollDirection <span class="token operator">=</span> Axis<span class="token punctuation">.</span>vertical<span class="token punctuation">,</span>
  bool reverse <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
  ScrollController controller<span class="token punctuation">,</span>
  bool primary<span class="token punctuation">,</span>
  ScrollPhysics physics<span class="token punctuation">,</span>
  EdgeInsetsGeometry padding<span class="token punctuation">,</span>

  <span class="token comment">//ListView&#x5404;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x5171;&#x540C;&#x53C2;&#x6570;  </span>
  double itemExtent<span class="token punctuation">,</span>
  bool shrinkWrap <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
  bool addAutomaticKeepAlives <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  bool addRepaintBoundaries <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  double cacheExtent<span class="token punctuation">,</span>

  <span class="token comment">//&#x5B50;widget&#x5217;&#x8868;</span>
  List<span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span> children <span class="token operator">=</span> <span class="token keyword">const</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x53C2;&#x6570;&#x5206;&#x4E3A;&#x4E24;&#x7EC4;&#xFF1A;&#x7B2C;&#x4E00;&#x7EC4;&#x662F;&#x53EF;&#x6EDA;&#x52A8;widget&#x516C;&#x5171;&#x53C2;&#x6570;&#xFF0C;&#x524D;&#x9762;&#x5DF2;&#x7ECF;&#x4ECB;&#x7ECD;&#x8FC7;&#xFF0C;&#x4E0D;&#x518D;&#x8D58;&#x8FF0;&#xFF1B;&#x7B2C;&#x4E8C;&#x7EC4;&#x662F;ListView&#x5404;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF08;ListView&#x6709;&#x591A;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF09;&#x7684;&#x5171;&#x540C;&#x53C2;&#x6570;&#xFF0C;&#x6211;&#x4EEC;&#x91CD;&#x70B9;&#x6765;&#x770B;&#x770B;&#x8FD9;&#x4E9B;&#x53C2;&#x6570;&#xFF0C;&#xFF1A;</p>
<ul>
<li>itemExtent&#xFF1A;&#x8BE5;&#x53C2;&#x6570;&#x5982;&#x679C;&#x4E0D;&#x4E3A;null&#xFF0C;&#x5219;&#x4F1A;&#x5F3A;&#x5236;children&#x7684;&quot;&#x957F;&#x5EA6;&quot;&#x4E3A;itemExtent&#x7684;&#x503C;&#xFF1B;&#x8FD9;&#x91CC;&#x7684;&quot;&#x957F;&#x5EA6;&quot;&#x662F;&#x6307;&#x6EDA;&#x52A8;&#x65B9;&#x5411;&#x4E0A;&#x5B50;widget&#x7684;&#x957F;&#x5EA6;&#xFF0C;&#x5373;&#x5982;&#x679C;&#x6EDA;&#x52A8;&#x65B9;&#x5411;&#x662F;&#x5782;&#x76F4;&#x65B9;&#x5411;&#xFF0C;&#x5219;itemExtent&#x4EE3;&#x8868;&#x5B50;widget&#x7684;&#x9AD8;&#x5EA6;&#xFF0C;&#x5982;&#x679C;&#x6EDA;&#x52A8;&#x65B9;&#x5411;&#x4E3A;&#x6C34;&#x5E73;&#x65B9;&#x5411;&#xFF0C;&#x5219;itemExtent&#x4EE3;&#x8868;&#x5B50;widget&#x7684;&#x957F;&#x5EA6;&#x3002;&#x5728;ListView&#x4E2D;&#xFF0C;&#x6307;&#x5B9A;itemExtent&#x6BD4;&#x8BA9;&#x5B50;widget&#x81EA;&#x5DF1;&#x51B3;&#x5B9A;&#x81EA;&#x8EAB;&#x957F;&#x5EA6;&#x4F1A;&#x66F4;&#x9AD8;&#x6548;&#xFF0C;&#x8FD9;&#x662F;&#x56E0;&#x4E3A;&#x6307;&#x5B9A;itemExtent&#x540E;&#xFF0C;&#x6EDA;&#x52A8;&#x7CFB;&#x7EDF;&#x53EF;&#x4EE5;&#x63D0;&#x524D;&#x77E5;&#x9053;&#x5217;&#x8868;&#x7684;&#x957F;&#x5EA6;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x603B;&#x662F;&#x52A8;&#x6001;&#x53BB;&#x8BA1;&#x7B97;&#xFF0C;&#x5C24;&#x5176;&#x662F;&#x5728;&#x6EDA;&#x52A8;&#x4F4D;&#x7F6E;&#x9891;&#x7E41;&#x53D8;&#x5316;&#x65F6;&#xFF08;&#x6EDA;&#x52A8;&#x7CFB;&#x7EDF;&#x9700;&#x8981;&#x9891;&#x7E41;&#x53BB;&#x8BA1;&#x7B97;&#x5217;&#x8868;&#x9AD8;&#x5EA6;&#xFF09;&#x3002;</li>
<li>shrinkWrap&#xFF1A;&#x8BE5;&#x5C5E;&#x6027;&#x8868;&#x793A;&#x662F;&#x5426;&#x6839;&#x636E;&#x5B50;widget&#x7684;&#x603B;&#x957F;&#x5EA6;&#x6765;&#x8BBE;&#x7F6E;ListView&#x7684;&#x957F;&#x5EA6;&#xFF0C;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;<code>false</code> &#x3002;&#x9ED8;&#x8BA4;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;ListView&#x7684;&#x4F1A;&#x5728;&#x6EDA;&#x52A8;&#x65B9;&#x5411;&#x5C3D;&#x53EF;&#x80FD;&#x591A;&#x7684;&#x5360;&#x7528;&#x7A7A;&#x95F4;&#x3002;&#x5F53;ListView&#x5728;&#x4E00;&#x4E2A;&#x65E0;&#x8FB9;&#x754C;(&#x6EDA;&#x52A8;&#x65B9;&#x5411;&#x4E0A;)&#x7684;&#x5BB9;&#x5668;&#x4E2D;&#x65F6;&#xFF0C;shrinkWrap&#x5FC5;&#x987B;&#x4E3A;<code>true</code>&#x3002;</li>
<li>addAutomaticKeepAlives&#xFF1A;&#x8BE5;&#x5C5E;&#x6027;&#x8868;&#x793A;&#x662F;&#x5426;&#x5C06;&#x5217;&#x8868;&#x9879;&#xFF08;&#x5B50;widget&#xFF09;&#x5305;&#x88F9;&#x5728;AutomaticKeepAlive widget&#x4E2D;&#xFF1B;&#x5178;&#x578B;&#x5730;&#xFF0C;&#x5728;&#x4E00;&#x4E2A;&#x61D2;&#x52A0;&#x8F7D;&#x5217;&#x8868;&#x4E2D;&#xFF0C;&#x5982;&#x679C;&#x5C06;&#x5217;&#x8868;&#x9879;&#x5305;&#x88F9;&#x5728;AutomaticKeepAlive&#x4E2D;&#xFF0C;&#x5728;&#x8BE5;&#x5217;&#x8868;&#x9879;&#x6ED1;&#x51FA;&#x89C6;&#x53E3;&#x65F6;&#x8BE5;&#x5217;&#x8868;&#x9879;&#x4E0D;&#x4F1A;&#x88AB;GC&#xFF0C;&#x5B83;&#x4F1A;&#x4F7F;&#x7528;KeepAliveNotification&#x6765;&#x4FDD;&#x5B58;&#x5176;&#x72B6;&#x6001;&#x3002;&#x5982;&#x679C;&#x5217;&#x8868;&#x9879;&#x81EA;&#x5DF1;&#x7EF4;&#x62A4;&#x5176;KeepAlive&#x72B6;&#x6001;&#xFF0C;&#x90A3;&#x4E48;&#x6B64;&#x53C2;&#x6570;&#x5FC5;&#x987B;&#x7F6E;&#x4E3A;<code>false</code>&#x3002;</li>
<li>addRepaintBoundaries&#xFF1A;&#x8BE5;&#x5C5E;&#x6027;&#x8868;&#x793A;&#x662F;&#x5426;&#x5C06;&#x5217;&#x8868;&#x9879;&#xFF08;&#x5B50;widget&#xFF09;&#x5305;&#x88F9;&#x5728;RepaintBoundary&#x4E2D;&#x3002;&#x5F53;&#x53EF;&#x6EDA;&#x52A8;widget&#x6EDA;&#x52A8;&#x65F6;&#xFF0C;&#x5C06;&#x5217;&#x8868;&#x9879;&#x5305;&#x88F9;&#x5728;RepaintBoundary&#x4E2D;&#x53EF;&#x4EE5;&#x907F;&#x514D;&#x5217;&#x8868;&#x9879;&#x91CD;&#x7ED8;&#xFF0C;&#x4F46;&#x662F;&#x5F53;&#x5217;&#x8868;&#x9879;&#x91CD;&#x7ED8;&#x7684;&#x5F00;&#x9500;&#x975E;&#x5E38;&#x5C0F;&#xFF08;&#x5982;&#x4E00;&#x4E2A;&#x989C;&#x8272;&#x5757;&#xFF0C;&#x6216;&#x8005;&#x4E00;&#x4E2A;&#x8F83;&#x77ED;&#x7684;&#x6587;&#x672C;&#xFF09;&#x65F6;&#xFF0C;&#x4E0D;&#x6DFB;&#x52A0;RepaintBoundary&#x53CD;&#x800C;&#x4F1A;&#x66F4;&#x9AD8;&#x6548;&#x3002;&#x548C;addAutomaticKeepAlive&#x4E00;&#x6837;&#xFF0C;&#x5982;&#x679C;&#x5217;&#x8868;&#x9879;&#x81EA;&#x5DF1;&#x7EF4;&#x62A4;&#x5176;KeepAlive&#x72B6;&#x6001;&#xFF0C;&#x90A3;&#x4E48;&#x6B64;&#x53C2;&#x6570;&#x5FC5;&#x987B;&#x7F6E;&#x4E3A;<code>false</code>&#x3002;</li>
</ul>
<blockquote>
<p>&#x6CE8;&#x610F;&#xFF1A;&#x4E0A;&#x9762;&#x8FD9;&#x4E9B;&#x53C2;&#x6570;&#x5E76;&#x975E;ListView&#x7279;&#x6709;&#xFF0C;&#x5728;&#x672C;&#x7AE0;&#x540E;&#x9762;&#x4ECB;&#x7ECD;&#x7684;&#x5176;&#x5B83;&#x53EF;&#x6EDA;&#x52A8;widget&#x4E5F;&#x53EF;&#x80FD;&#x4F1A;&#x62E5;&#x6709;&#x8FD9;&#x4E9B;&#x53C2;&#x6570;&#xFF0C;&#x5B83;&#x4EEC;&#x7684;&#x542B;&#x4E49;&#x662F;&#x76F8;&#x540C;&#x7684;&#x3002;</p>
</blockquote>
<h3 id="&#x9ED8;&#x8BA4;&#x6784;&#x9020;&#x51FD;&#x6570;">&#x9ED8;&#x8BA4;&#x6784;&#x9020;&#x51FD;&#x6570;</h3>
<p>&#x9ED8;&#x8BA4;&#x6784;&#x9020;&#x51FD;&#x6570;&#x6709;&#x4E00;&#x4E2A;<code>children</code>&#x53C2;&#x6570;&#xFF0C;&#x5B83;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;Widget&#x5217;&#x8868;&#xFF08;List<widget>&#xFF09;&#x3002;&#x8FD9;&#x79CD;&#x65B9;&#x5F0F;&#x9002;&#x5408;&#x53EA;&#x6709;&#x5C11;&#x91CF;&#x7684;&#x5B50;widget&#x7684;&#x60C5;&#x51B5;&#xFF0C;&#x56E0;&#x4E3A;&#x8FD9;&#x79CD;&#x65B9;&#x5F0F;&#x9700;&#x8981;&#x5C06;&#x6240;&#x6709;<code>children</code>&#x90FD;&#x63D0;&#x524D;&#x521B;&#x5EFA;&#x597D;&#xFF08;&#x8FD9;&#x9700;&#x8981;&#x505A;&#x5927;&#x91CF;&#x5DE5;&#x4F5C;&#xFF09;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x7B49;&#x5230;&#x5B50;widget&#x771F;&#x6B63;&#x663E;&#x793A;&#x7684;&#x65F6;&#x5019;&#x518D;&#x521B;&#x5EFA;&#x3002;&#x5B9E;&#x9645;&#x4E0A;&#x901A;&#x8FC7;&#x6B64;&#x65B9;&#x5F0F;&#x521B;&#x5EFA;&#x7684;ListView&#x548C;&#x4F7F;&#x7528;SingleChildScrollView+Column&#x7684;&#x65B9;&#x5F0F;&#x6CA1;&#x6709;&#x672C;&#x8D28;&#x7684;&#x533A;&#x522B;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF1A;</widget></p>
<pre class="language-"><code class="lang-dart"><span class="token function">ListView</span><span class="token punctuation">(</span>
  shrinkWrap<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> 
  padding<span class="token punctuation">:</span> <span class="token keyword">const</span> EdgeInsets<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span><span class="token number">20.0</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
    <span class="token keyword">const</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;I\&apos;m dedicating every day to you&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">const</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;Domestic life was never quite my style&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">const</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;When you smile, you knock me out, I fall apart&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">const</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;And I thought I was so smart&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<blockquote>
<p>&#x6CE8;&#x610F;&#xFF1A;&#x53EF;&#x6EDA;&#x52A8;widget&#x901A;&#x8FC7;&#x4E00;&#x4E2A;List<widget>&#x6765;&#x4F5C;&#x4E3A;&#x5176;children&#x5C5E;&#x6027;&#x65F6;&#xFF0C;&#x53EA;&#x9002;&#x7528;&#x4E8E;&#x5B50;widget&#x8F83;&#x5C11;&#x7684;&#x60C5;&#x51B5;&#xFF0C;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x901A;&#x7528;&#x89C4;&#x5F8B;&#xFF0C;&#x5E76;&#x975E;ListView&#x81EA;&#x5DF1;&#x7684;&#x7279;&#x6027;&#xFF0C;&#x50CF;GridView&#x4E5F;&#x662F;&#x5982;&#x6B64;&#x3002;</widget></p>
</blockquote>
<h3 id="listviewbuilder">ListView.builder</h3>
<p><code>ListView.builder</code>&#x9002;&#x5408;&#x5217;&#x8868;&#x9879;&#x6BD4;&#x8F83;&#x591A;&#xFF08;&#x6216;&#x8005;&#x65E0;&#x9650;&#xFF09;&#x7684;&#x60C5;&#x51B5;&#xFF0C;&#x56E0;&#x4E3A;&#x53EA;&#x6709;&#x5F53;&#x5B50;Widget&#x771F;&#x6B63;&#x663E;&#x793A;&#x7684;&#x65F6;&#x5019;&#x624D;&#x4F1A;&#x88AB;&#x521B;&#x5EFA;&#x3002;&#x4E0B;&#x9762;&#x770B;&#x4E00;&#x4E0B;ListView.builder&#x7684;&#x6838;&#x5FC3;&#x53C2;&#x6570;&#x5217;&#x8868;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">ListView<span class="token punctuation">.</span><span class="token function">builder</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token comment">// ListView&#x516C;&#x5171;&#x53C2;&#x6570;&#x5DF2;&#x7701;&#x7565;  </span>
  <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
  <span class="token metadata symbol">@required</span> IndexedWidgetBuilder itemBuilder<span class="token punctuation">,</span>
  int itemCount<span class="token punctuation">,</span>
  <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<ul>
<li>itemBuilder&#xFF1A;&#x5B83;&#x662F;&#x5217;&#x8868;&#x9879;&#x7684;&#x6784;&#x5EFA;&#x5668;&#xFF0C;&#x7C7B;&#x578B;&#x4E3A;IndexedWidgetBuilder&#xFF0C;&#x8FD4;&#x56DE;&#x503C;&#x4E3A;&#x4E00;&#x4E2A;widget&#x3002;&#x5F53;&#x5217;&#x8868;&#x6EDA;&#x52A8;&#x5230;&#x5177;&#x4F53;&#x7684;index&#x4F4D;&#x7F6E;&#x65F6;&#xFF0C;&#x4F1A;&#x8C03;&#x7528;&#x8BE5;&#x6784;&#x5EFA;&#x5668;&#x6784;&#x5EFA;&#x5217;&#x8868;&#x9879;&#x3002;</li>
<li>itemCount&#xFF1A;&#x5217;&#x8868;&#x9879;&#x7684;&#x6570;&#x91CF;&#xFF0C;&#x5982;&#x679C;&#x4E3A;null&#xFF0C;&#x5219;&#x4E3A;&#x65E0;&#x9650;&#x5217;&#x8868;&#x3002;</li>
</ul>
<p>&#x770B;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">ListView<span class="token punctuation">.</span><span class="token function">builder</span><span class="token punctuation">(</span>
    itemCount<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span>
    itemExtent<span class="token punctuation">:</span> <span class="token number">50.0</span><span class="token punctuation">,</span> <span class="token comment">//&#x5F3A;&#x5236;&#x9AD8;&#x5EA6;&#x4E3A;50.0</span>
    itemBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;$index&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p><img src="https://cdn.jsdelivr.net/gh/flutterchina/flutter-in-action@1.0/docs/imgs/image-20180911171508400.png" alt="image-20180911171508400"></p>
<h3 id="listviewseparated">ListView.separated</h3>
<p><code>ListView.separated</code>&#x53EF;&#x4EE5;&#x751F;&#x6210;&#x5217;&#x8868;&#x9879;&#x4E4B;&#x95F4;&#x7684;&#x5206;&#x5272;&#x5668;&#xFF0C;&#x5B83;&#x9664;&#x4E86;&#x6BD4;<code>ListView.builder</code>&#x591A;&#x4E86;&#x4E00;&#x4E2A;<code>separatorBuilder</code>&#x53C2;&#x6570;&#xFF0C;&#x8BE5;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x5206;&#x5272;&#x5668;&#x751F;&#x6210;&#x5668;&#x3002;&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x770B;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF1A;&#x5947;&#x6570;&#x884C;&#x6DFB;&#x52A0;&#x4E00;&#x6761;&#x84DD;&#x8272;&#x4E0B;&#x5212;&#x7EBF;&#xFF0C;&#x5076;&#x6570;&#x884C;&#x6DFB;&#x52A0;&#x4E00;&#x6761;&#x7EFF;&#x8272;&#x4E0B;&#x5212;&#x7EBF;&#x3002;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">ListView3</span> <span class="token keyword">extends</span> <span class="token class-name">StatelessWidget</span> <span class="token punctuation">{</span>
  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">//&#x4E0B;&#x5212;&#x7EBF;widget&#x9884;&#x5B9A;&#x4E49;&#x4EE5;&#x4F9B;&#x590D;&#x7528;&#x3002;  </span>
    Widget divider1<span class="token operator">=</span><span class="token function">Divider</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">,</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    Widget divider2<span class="token operator">=</span><span class="token function">Divider</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>green<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> ListView<span class="token punctuation">.</span><span class="token function">separated</span><span class="token punctuation">(</span>
        itemCount<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span>
        <span class="token comment">//&#x5217;&#x8868;&#x9879;&#x6784;&#x9020;&#x5668;</span>
        itemBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token keyword">return</span> <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;$index&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token comment">//&#x5206;&#x5272;&#x5668;&#x6784;&#x9020;&#x5668;</span>
        separatorBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token keyword">return</span> index<span class="token operator">%</span><span class="token number">2</span><span class="token operator">==</span><span class="token number">0</span><span class="token operator">?</span>divider1<span class="token punctuation">:</span>divider2<span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p><img src="https://cdn.jsdelivr.net/gh/flutterchina/flutter-in-action@1.0/docs/imgs/image-20180911172832687.png" alt="image-20180911172832687"></p>
<h3 id="&#x5B9E;&#x4F8B;&#xFF1A;&#x65E0;&#x9650;&#x52A0;&#x8F7D;&#x5217;&#x8868;">&#x5B9E;&#x4F8B;&#xFF1A;&#x65E0;&#x9650;&#x52A0;&#x8F7D;&#x5217;&#x8868;</h3>
<p>&#x5047;&#x8BBE;&#x6211;&#x4EEC;&#x8981;&#x4ECE;&#x6570;&#x636E;&#x6E90;&#x5F02;&#x6B65;&#x5206;&#x6279;&#x62C9;&#x53D6;&#x4E00;&#x4E9B;&#x6570;&#x636E;&#xFF0C;&#x7136;&#x540E;&#x7528;ListView&#x663E;&#x793A;&#xFF0C;&#x5F53;&#x6211;&#x4EEC;&#x6ED1;&#x52A8;&#x5230;&#x5217;&#x8868;&#x672B;&#x5C3E;&#x65F6;&#xFF0C;&#x5224;&#x65AD;&#x662F;&#x5426;&#x9700;&#x8981;&#x518D;&#x53BB;&#x62C9;&#x53D6;&#x6570;&#x636E;&#xFF0C;&#x5982;&#x679C;&#x662F;&#xFF0C;&#x5219;&#x53BB;&#x62C9;&#x53D6;&#xFF0C;&#x62C9;&#x53D6;&#x8FC7;&#x7A0B;&#x4E2D;&#x5728;&#x8868;&#x5C3E;&#x663E;&#x793A;&#x4E00;&#x4E2A;loading&#xFF0C;&#x62C9;&#x53D6;&#x6210;&#x529F;&#x540E;&#x5C06;&#x6570;&#x636E;&#x63D2;&#x5165;&#x5217;&#x8868;&#xFF1B;&#x5982;&#x679C;&#x4E0D;&#x9700;&#x8981;&#x518D;&#x53BB;&#x62C9;&#x53D6;&#xFF0C;&#x5219;&#x5728;&#x8868;&#x5C3E;&#x63D0;&#x793A;&quot;&#x6CA1;&#x6709;&#x66F4;&#x591A;&quot;&#x3002;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">InfiniteListView</span> <span class="token keyword">extends</span> <span class="token class-name">StatefulWidget</span> <span class="token punctuation">{</span>
  <span class="token metadata symbol">@override</span>
  _InfiniteListViewState <span class="token function">createState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token keyword">new</span> <span class="token class-name">_InfiniteListViewState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">_InfiniteListViewState</span> <span class="token keyword">extends</span> <span class="token class-name">State</span><span class="token operator">&lt;</span>InfiniteListView<span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">static</span> <span class="token keyword">const</span> loadingTag <span class="token operator">=</span> <span class="token string">&quot;##loading##&quot;</span><span class="token punctuation">;</span> <span class="token comment">//&#x8868;&#x5C3E;&#x6807;&#x8BB0;</span>
  <span class="token keyword">var</span> _words <span class="token operator">=</span> <span class="token operator">&lt;</span>String<span class="token operator">&gt;</span><span class="token punctuation">[</span>loadingTag<span class="token punctuation">]</span><span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  <span class="token keyword">void</span> <span class="token function">initState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">_retrieveData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> ListView<span class="token punctuation">.</span><span class="token function">separated</span><span class="token punctuation">(</span>
      itemCount<span class="token punctuation">:</span> _words<span class="token punctuation">.</span>length<span class="token punctuation">,</span>
      itemBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>context<span class="token punctuation">,</span> index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//&#x5982;&#x679C;&#x5230;&#x4E86;&#x8868;&#x5C3E;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>_words<span class="token punctuation">[</span>index<span class="token punctuation">]</span> <span class="token operator">==</span> loadingTag<span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token comment">//&#x4E0D;&#x8DB3;100&#x6761;&#xFF0C;&#x7EE7;&#x7EED;&#x83B7;&#x53D6;&#x6570;&#x636E;</span>
          <span class="token keyword">if</span> <span class="token punctuation">(</span>_words<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span> <span class="token operator">&lt;</span> <span class="token number">100</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment">//&#x83B7;&#x53D6;&#x6570;&#x636E;</span>
            <span class="token function">_retrieveData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//&#x52A0;&#x8F7D;&#x65F6;&#x663E;&#x793A;loading</span>
            <span class="token keyword">return</span> <span class="token function">Container</span><span class="token punctuation">(</span>
              padding<span class="token punctuation">:</span> <span class="token keyword">const</span> EdgeInsets<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span><span class="token number">16.0</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
              alignment<span class="token punctuation">:</span> Alignment<span class="token punctuation">.</span>center<span class="token punctuation">,</span>
              child<span class="token punctuation">:</span> <span class="token function">SizedBox</span><span class="token punctuation">(</span>
                  width<span class="token punctuation">:</span> <span class="token number">24.0</span><span class="token punctuation">,</span>
                  height<span class="token punctuation">:</span> <span class="token number">24.0</span><span class="token punctuation">,</span>
                  child<span class="token punctuation">:</span> <span class="token function">CircularProgressIndicator</span><span class="token punctuation">(</span>strokeWidth<span class="token punctuation">:</span> <span class="token number">2.0</span><span class="token punctuation">)</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">;</span>
          <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
            <span class="token comment">//&#x5DF2;&#x7ECF;&#x52A0;&#x8F7D;&#x4E86;100&#x6761;&#x6570;&#x636E;&#xFF0C;&#x4E0D;&#x518D;&#x83B7;&#x53D6;&#x6570;&#x636E;&#x3002;</span>
            <span class="token keyword">return</span> <span class="token function">Container</span><span class="token punctuation">(</span>
                alignment<span class="token punctuation">:</span> Alignment<span class="token punctuation">.</span>center<span class="token punctuation">,</span>
                padding<span class="token punctuation">:</span> EdgeInsets<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span><span class="token number">16.0</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
                child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;&#x6CA1;&#x6709;&#x66F4;&#x591A;&#x4E86;&quot;</span><span class="token punctuation">,</span> style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>grey<span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token punctuation">)</span>
            <span class="token punctuation">)</span><span class="token punctuation">;</span>
          <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        <span class="token comment">//&#x663E;&#x793A;&#x5355;&#x8BCD;&#x5217;&#x8868;&#x9879;</span>
        <span class="token keyword">return</span> <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>_words<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
      separatorBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>context<span class="token punctuation">,</span> index<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">Divider</span><span class="token punctuation">(</span>height<span class="token punctuation">:</span> <span class="token number">.0</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">void</span> <span class="token function">_retrieveData</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Future<span class="token punctuation">.</span><span class="token function">delayed</span><span class="token punctuation">(</span><span class="token function">Duration</span><span class="token punctuation">(</span>seconds<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      _words<span class="token punctuation">.</span><span class="token function">insertAll</span><span class="token punctuation">(</span>_words<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">,</span>
          <span class="token comment">//&#x6BCF;&#x6B21;&#x751F;&#x6210;20&#x4E2A;&#x5355;&#x8BCD;</span>
          <span class="token function">generateWordPairs</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">take</span><span class="token punctuation">(</span><span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> e<span class="token punctuation">.</span>asPascalCase<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//&#x91CD;&#x65B0;&#x6784;&#x5EFA;&#x5217;&#x8868;</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

<span class="token punctuation">}</span>
</code></pre>
<p><img src="https://cdn.jsdelivr.net/gh/flutterchina/flutter-in-action@1.0/docs/imgs/image-20180912152627343.png" alt="image-20180912152627343"><img src="https://cdn.jsdelivr.net/gh/flutterchina/flutter-in-action@1.0/docs/imgs/image-20180912153208597.png" alt="image-20180912153208597"></p>
<p>&#x4EE3;&#x7801;&#x6BD4;&#x8F83;&#x7B80;&#x5355;&#xFF0C;&#x8BFB;&#x8005;&#x53EF;&#x4EE5;&#x53C2;&#x7167;&#x4EE3;&#x7801;&#x4E2D;&#x7684;&#x6CE8;&#x91CA;&#x7406;&#x89E3;&#xFF0C;&#x6545;&#x4E0D;&#x518D;&#x8D58;&#x8FF0;&#x3002;&#x9700;&#x8981;&#x8BF4;&#x660E;&#x7684;&#x662F;&#xFF0C;<code>_retrieveData()</code>&#x7684;&#x529F;&#x80FD;&#x662F;&#x6A21;&#x62DF;&#x4ECE;&#x6570;&#x636E;&#x6E90;&#x5F02;&#x6B65;&#x83B7;&#x53D6;&#x6570;&#x636E;&#xFF0C;&#x6211;&#x4EEC;&#x4F7F;&#x7528;english_words&#x5305;&#x7684;<code>generateWordPairs()</code>&#x65B9;&#x6CD5;&#x6BCF;&#x6B21;&#x751F;&#x6210;20&#x4E2A;&#x5355;&#x8BCD;&#x3002;</p>
<h3 id="&#x6DFB;&#x52A0;&#x56FA;&#x5B9A;&#x8868;&#x5934;">&#x6DFB;&#x52A0;&#x56FA;&#x5B9A;&#x8868;&#x5934;</h3>
<p>&#x5F88;&#x591A;&#x65F6;&#x5019;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x7ED9;&#x5217;&#x8868;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;&#x56FA;&#x5B9A;&#x8868;&#x5934;&#xFF0C;&#x6BD4;&#x5982;&#x6211;&#x4EEC;&#x60F3;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x5546;&#x54C1;&#x5217;&#x8868;&#xFF0C;&#x9700;&#x8981;&#x5728;&#x5217;&#x8868;&#x9876;&#x90E8;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;&#x201C;&#x5546;&#x54C1;&#x5217;&#x8868;&#x201D;&#x6807;&#x9898;&#xFF0C;&#x6548;&#x679C;&#x5982;&#x4E0B;&#xFF1A;</p>
<p><img src="https://cdn.jsdelivr.net/gh/flutterchina/flutter-in-action/docs/imgs/Screenshot_1547537184.png" alt="Screenshot_1547537184"></p>
<p>&#x6211;&#x4EEC;&#x6309;&#x7167;&#x4E4B;&#x524D;&#x7ECF;&#x9A8C;&#xFF0C;&#x5199;&#x51FA;&#x5982;&#x4E0B;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token metadata symbol">@override</span>
Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token function">Column</span><span class="token punctuation">(</span>children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
    <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span><span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;&#x5546;&#x54C1;&#x5217;&#x8868;&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    ListView<span class="token punctuation">.</span><span class="token function">builder</span><span class="token punctuation">(</span>itemBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;$index&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x7136;&#x540E;&#x8FD0;&#x884C;&#xFF0C;&#x53D1;&#x73B0;&#x5E76;&#x6CA1;&#x6709;&#x51FA;&#x73B0;&#x6211;&#x4EEC;&#x671F;&#x671B;&#x7684;&#x6548;&#x679C;&#xFF0C;&#x76F8;&#x53CD;&#x89E6;&#x53D1;&#x4E86;&#x4E00;&#x4E2A;&#x5F02;&#x5E38;&#xFF1B;</p>
<pre class="language-"><code>Error caught by rendering library, thrown during performResize()&#x3002;
Vertical viewport was given unbounded height ...
</code></pre><p>&#x4ECE;&#x5F02;&#x5E38;&#x4FE1;&#x606F;&#x4E2D;&#x6211;&#x4EEC;&#x53EF;&#x5230;&#x662F;&#x56E0;&#x4E3A;ListView&#x9AD8;&#x5EA6;&#x8FB9;&#x754C;&#x65E0;&#x6CD5;&#x786E;&#x5B9A;&#x5F15;&#x8D77;&#xFF0C;&#x6240;&#x4EE5;&#x89E3;&#x51B3;&#x7684;&#x529E;&#x6CD5;&#x4E5F;&#x5F88;&#x660E;&#x663E;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x7ED9;ListView&#x6307;&#x5B9A;&#x8FB9;&#x754C;&#xFF0C;&#x6211;&#x4EEC;&#x901A;&#x8FC7;<code>SizedBox</code>&#x6307;&#x5B9A;&#x4E00;&#x4E2A;&#x5217;&#x8868;&#x9AD8;&#x5EA6;&#x770B;&#x770B;&#x662F;&#x5426;&#x751F;&#x6548;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> <span class="token comment">//&#x7701;&#x7565;&#x65E0;&#x5173;&#x4EE3;&#x7801;</span>
<span class="token function">SizedBox</span><span class="token punctuation">(</span>
    height<span class="token punctuation">:</span> <span class="token number">400</span><span class="token punctuation">,</span> <span class="token comment">//&#x6307;&#x5B9A;&#x5217;&#x8868;&#x9AD8;&#x5EA6;&#x4E3A;400</span>
    child<span class="token punctuation">:</span> ListView<span class="token punctuation">.</span><span class="token function">builder</span><span class="token punctuation">(</span>itemBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;$index&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
</code></pre>
<p>&#x8FD0;&#x884C;&#x6548;&#x679C;&#x5982;&#x4E0B;&#xFF1A;</p>
<p><img src="../Users/duwen/Documents/resource/flutter in action/book/docs/imgs/20190115153643.png" alt="20190115153643"></p>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;&#x73B0;&#x5728;&#x6CA1;&#x6709;&#x89E6;&#x53D1;&#x5F02;&#x5E38;&#x5E76;&#x4E14;&#x5217;&#x8868;&#x5DF2;&#x7ECF;&#x663E;&#x793A;&#x51FA;&#x6765;&#x4E86;&#xFF0C;&#x4F46;&#x662F;&#x6211;&#x4EEC;&#x7684;&#x624B;&#x673A;&#x5C4F;&#x5E55;&#x9AD8;&#x5EA6;&#x8981;&#x5927;&#x4E8E;400&#xFF0C;&#x6240;&#x4EE5;&#x5E95;&#x90E8;&#x4F1A;&#x6709;&#x4E00;&#x4E9B;&#x7A7A;&#x767D;&#xFF0C;&#x90A3;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x8981;&#x5B9E;&#x73B0;&#x5217;&#x8868;&#x94FA;&#x6EE1;&#x9664;&#x8FC7;&#x8868;&#x5934;&#x4EE5;&#x5916;&#x7684;&#x5C4F;&#x5E55;&#x7A7A;&#x95F4;&#x5462;&#xFF1F;&#x76F4;&#x89C2;&#x7684;&#x65B9;&#x6CD5;&#x662F;&#x6211;&#x4EEC;&#x52A8;&#x6001;&#x8BA1;&#x7B97;&#xFF0C;&#x7528;&#x5C4F;&#x5E55;&#x9AD8;&#x5EA6;&#x51CF;&#x53BB;&#x72B6;&#x6001;&#x680F;&#x3001;&#x5BFC;&#x822A;&#x680F;&#x3001;&#x8868;&#x5934;&#x7684;&#x9AD8;&#x5EA6;&#x5373;&#x4E3A;&#x5269;&#x4F59;&#x5C4F;&#x5E55;&#x9AD8;&#x5EA6;&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> <span class="token comment">//&#x7701;&#x7565;&#x65E0;&#x5173;&#x4EE3;&#x7801;</span>
<span class="token function">SizedBox</span><span class="token punctuation">(</span>
  <span class="token comment">//Material&#x8BBE;&#x8BA1;&#x89C4;&#x8303;&#x4E2D;&#x72B6;&#x6001;&#x680F;&#x3001;&#x5BFC;&#x822A;&#x680F;&#x3001;ListTile&#x9AD8;&#x5EA6;&#x5206;&#x522B;&#x4E3A;24&#x3001;56&#x3001;56 </span>
  height<span class="token punctuation">:</span> MediaQuery<span class="token punctuation">.</span><span class="token function">of</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span><span class="token punctuation">.</span>size<span class="token punctuation">.</span>height<span class="token operator">-</span><span class="token number">24</span><span class="token operator">-</span><span class="token number">56</span><span class="token operator">-</span><span class="token number">56</span><span class="token punctuation">,</span>
  child<span class="token punctuation">:</span> ListView<span class="token punctuation">.</span><span class="token function">builder</span><span class="token punctuation">(</span>itemBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;$index&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
</code></pre>
<p>&#x8FD0;&#x884C;&#x6548;&#x679C;&#x5982;&#x4E0B;&#xFF1A;</p>
<p><img src="https://cdn.jsdelivr.net/gh/flutterchina/flutter-in-action/docs/imgs/Screenshot_1547537184.png" alt="Screenshot_1547537184"></p>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;&#x6211;&#x4EEC;&#x671F;&#x671B;&#x7684;&#x6548;&#x679C;&#x5B9E;&#x73B0;&#x4E86;&#xFF0C;&#x4F46;&#x662F;&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x5E76;&#x4E0D;&#x4F18;&#x96C5;&#xFF0C;&#x5982;&#x679C;&#x9875;&#x9762;&#x5E03;&#x5C40;&#x53D1;&#x751F;&#x53D8;&#x5316;&#xFF0C;&#x5982;&#x8868;&#x5934;&#x5E03;&#x5C40;&#x8C03;&#x6574;&#x5BFC;&#x81F4;&#x8868;&#x5934;&#x9AD8;&#x5EA6;&#x6539;&#x53D8;&#xFF0C;&#x90A3;&#x4E48;&#x5269;&#x4F59;&#x7A7A;&#x95F4;&#x7684;&#x9AD8;&#x5EA6;&#x5C31;&#x5F97;&#x91CD;&#x65B0;&#x8BA1;&#x7B97;&#xFF0C;&#x90A3;&#x4E48;&#x6709;&#x4EC0;&#x4E48;&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x81EA;&#x52A8;&#x62C9;&#x5347;ListView&#x4EE5;&#x586B;&#x5145;&#x5C4F;&#x5E55;&#x5269;&#x4F59;&#x7A7A;&#x95F4;&#x7684;&#x65B9;&#x6CD5;&#x5417;&#xFF1F;&#x5F53;&#x7136;&#x6709;&#xFF01;&#x7B54;&#x6848;&#x5C31;&#x662F;Flex&#x3002;&#x524D;&#x9762;&#x5DF2;&#x7ECF;&#x4ECB;&#x7ECD;&#x8FC7;&#x5728;Flex&#x5E03;&#x5C40;&#x4E2D;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;Expanded&#x81EA;&#x52A8;&#x62C9;&#x4F38;&#x7EC4;&#x4EF6;&#x5927;&#x5C0F;&#x7684;Widget&#xFF0C;&#x6211;&#x4EEC;&#x4E5F;&#x8BF4;&#x8FC7;Column&#x662F;&#x7EE7;&#x627F;&#x81EA;Flex&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4F7F;&#x7528;Column+Expanded&#x6765;&#x5B9E;&#x73B0;&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token metadata symbol">@override</span>
Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token function">Column</span><span class="token punctuation">(</span>children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
    <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span><span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;&#x5546;&#x54C1;&#x5217;&#x8868;&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token function">Expanded</span><span class="token punctuation">(</span>
      child<span class="token punctuation">:</span> ListView<span class="token punctuation">.</span><span class="token function">builder</span><span class="token punctuation">(</span>itemBuilder<span class="token punctuation">:</span> <span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token function">ListTile</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;$index&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="&#x603B;&#x7ED3;">&#x603B;&#x7ED3;</h3>
<p>&#x672C;&#x8282;&#x4E3B;&#x8981;&#x4ECB;&#x7ECD;&#x4E86;ListView&#x7684;&#x4E00;&#x4E9B;&#x516C;&#x5171;&#x53C2;&#x6570;&#x4EE5;&#x53CA;&#x5E38;&#x7528;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;&#x4E0D;&#x540C;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5BF9;&#x5E94;&#x4E86;&#x4E0D;&#x540C;&#x7684;&#x5217;&#x8868;&#x9879;&#x751F;&#x6210;&#x6A21;&#x578B;&#xFF0C;&#x5982;&#x679C;&#x9700;&#x8981;&#x81EA;&#x5B9A;&#x4E49;&#x5217;&#x8868;&#x9879;&#x751F;&#x6210;&#x6A21;&#x578B;&#xFF0C;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>ListView.custom</code>&#x6765;&#x81EA;&#x5B9A;&#x4E49;&#xFF0C;&#x5B83;&#x9700;&#x8981;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;SliverChildDelegate&#x7528;&#x6765;&#x7ED9;ListView&#x751F;&#x6210;&#x5217;&#x8868;&#x9879;widget&#xFF0C;&#x66F4;&#x591A;&#x8BE6;&#x60C5;&#x8BF7;&#x53C2;&#x8003;API&#x6587;&#x6863;&#x3002;</p>

                                
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